In this article

07/23/2014

2 minutes to read

In this article

Intelligent Message Filter custom response present

[This topic is intended to address a specific issue called out by the Exchange Server Analyzer Tool. You should apply it only to systems that have had the Exchange Server Analyzer Tool run against them and are experiencing that specific issue. The Exchange Server Analyzer Tool, available as a free download, remotely collects configuration data from each server in the topology and automatically analyzes the data. The resulting report details important configuration issues, potential problems, and nondefault product settings. By following these recommendations, you can achieve better performance, scalability, reliability, and uptime. For more information about the tool or to download the latest versions, see "Microsoft Exchange Analyzers" at http://go.microsoft.com/fwlink/?linkid=34707.]

Topic Last Modified: 2005-11-18

The Microsoft® Exchange Server Analyzer Tool reads the following registry key to determine whether the CustomRejectResponse registry value is present:

HKEY_LOCAL_MACHINE\Software\Microsoft\Exchange\ContentFilter

The Exchange Server Analyzer displays a non-default configuration message if the following conditions exist:

The CustomRejectResponse value is present.

This value is a valid string.

Note

The response string value must start with 550 5.7.1 to be recognized as valid.

No remedial action is required.

In Exchange Server 2003 Service Pack 2 (SP2), intelligent message filtering is installed and ready to use when you install SP2. Exchange Server 2003 SP2 allows for customization of the server response string that is generated and appended to the non-delivery report (NDR) sent back to the sender. The default response of 550 5.7.1 Requested action not taken: message refused can be changed to provide blocked legitimate users with a meaningful explanation as to why their message was blocked. This explanation can help reduce investigation of false positives and decrease support costs associated with the anti-spam processing.

Important

This article contains information about editing the registry. Before you edit the registry, make sure you understand how to restore the registry if a problem occurs. For information about how to restore the registry, view the "Restore the Registry" Help topic in Regedit.exe or Regedt32.exe.

To change the custom response string

Open a registry editor, such as Regedit.exe or Regedt32.exe.

Navigate to: HKLM\Software\Microsoft\Exchange\ContentFilter

In the right task pane, right-click the CustomRejectResponse value and select Modify.

Enter the string value you want to use as the custom response, starting the string with 550 5.7.1. For example, you can enter 550 5.7.1 Domain not an allowed sender to set the string to a valid string that will be appended to the NDR.

Save the changes, exit the registry editor, and restart the SMTP service for the changes to take effect.